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Subject: Re: [OMPI users] change between openmpi 1.4.1 and 1.5.1 about MPI2 publish name
From: Bernard Secher - SFME/LGLS (bernard.secher_at_[hidden])
Date: 2011-01-07 04:17:57


Jeff,

Only the processes of the program where process 0 successed to publish
name, have srv=1 and then call MPI_Comm_accept.
The processes of the program where process 0 failed to publish name,
have srv=0 and then call MPI_Comm_connect.

That's worked like this with openmpi 1.4.1.

Is it different whith openmpi 1.5.1 ?

Best
Bernard

Jeff Squyres a écrit :
> On Jan 5, 2011, at 10:36 AM, Bernard Secher - SFME/LGLS wrote:
>
>
>> MPI_Comm remoteConnect(int myrank, int *srv, char *port_name, char* service)
>> {
>> int clt=0;
>> MPI_Request request; /* requete pour communication non bloquante */
>> MPI_Comm gcom;
>> MPI_Status status;
>> char port_name_clt[MPI_MAX_PORT_NAME];
>>
>> if( service == NULL ) service = defaultService;
>>
>> /* only process of rank null can publish name */
>> MPI_Barrier(MPI_COMM_WORLD);
>>
>> /* A lookup for an unpublished service generate an error */
>> MPI_Errhandler_set(MPI_COMM_WORLD, MPI_ERRORS_RETURN);
>> if( myrank == 0 ){
>> /* Try to be a server. If there service is already published, try to be a cient */
>> MPI_Open_port(MPI_INFO_NULL, port_name);
>> printf("[%d] Publish name\n",myrank);
>> if ( MPI_Publish_name(service, MPI_INFO_NULL, port_name) == MPI_SUCCESS ) {
>> *srv = 1;
>> printf("[%d] service %s available at %s\n",myrank,service,port_name);
>> }
>> else if ( MPI_Lookup_name(service, MPI_INFO_NULL, port_name_clt) == MPI_SUCCESS ){
>> MPI_Close_port( port_name );
>> clt = 1;
>> }
>> else
>> /* Throw exception */
>> printf("[%d] Error\n",myrank);
>> }
>> else{
>> /* Waiting rank 0 publish name */
>> sleep(1);
>> printf("[%d] Lookup name\n",myrank);
>> if ( MPI_Lookup_name(service, MPI_INFO_NULL, port_name_clt) == MPI_SUCCESS ){
>> clt = 1;
>> }
>> else
>> /* Throw exception */
>> ;
>> }
>> MPI_Errhandler_set(MPI_COMM_WORLD, MPI_ERRORS_ARE_FATAL);
>>
>> MPI_Bcast(srv,1,MPI_INT,0,MPI_COMM_WORLD);
>>
>
> You're broadcasting srv here -- won't everyone now have *srv==1, such that they all call MPI_COMM_ACCEPT, below?
>
>
>> if ( *srv )
>> /* I am the Master */
>> MPI_Comm_accept( port_name, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &gcom );
>> else{
>> /* Connect to service SERVER, get the inter-communicator server*/
>> MPI_Errhandler_set(MPI_COMM_WORLD, MPI_ERRORS_RETURN);
>> if ( MPI_Comm_connect(port_name_clt, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &gcom ) == MPI_SUCCESS )
>> printf("[%d] I get the connection with %s at %s !\n",myrank, service, port_name_clt);
>> MPI_Errhandler_set(MPI_COMM_WORLD, MPI_ERRORS_ARE_FATAL);
>> }
>>
>> if(myrank != 0) *srv = 0;
>>
>> return gcom;
>>
>> }
>>
>>
>>
>>
>> _______________________________________________
>> users mailing list
>> users_at_[hidden]
>> http://www.open-mpi.org/mailman/listinfo.cgi/users
>>
>
>
>

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